Panasonic 7~14mm or Olympus 12mm ?

If you're not sure you can rent them and try them. They are very different lenses. It might make sense to own one and rent the other as needed. The real question is 7mm to 10mm (14mm to 20mm equiv.). Do you take a lot of shots in that range? If a lot of your shots are around 24mm, then you know.

Delicious dilemma!

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SLOtographer"If we limit our vision to the real world, we will forever be fighting on the minus side of things, working only too make our photographs equal to what we see out there, but no better." -- Galen Rowell